The acquirement of spiritual wisdom does not necessarily prevent us from making worldly mistakes; but because it develops the qualities that will prevent them, and because it takes to heart the lessons of experience, humbly and receptively, it does reduce the frequency of those mistakes.
And I said to the one who stood at the gate of the year: "Give me a light that I may tread safely into the unknown." The reply: "Go out into the darkness and put your hand into the Hand of God. That will be to you better than light, and safer than a known way."